docs: add Zenodo DOI badge

[nh13]

holodeck is now archived on Zenodo via the GitHub integration, with its release history backfilled.

This adds a DOI badge using 10.5281/zenodo.21445789, the concept DOI covering all versions, which always resolves to the latest release.

Verified: https://zenodo.org/api/records/21445789 → 10.5281/zenodo.21445908, version v0.3.0.

Summary by CodeRabbit

• Documentation
  • Added a DOI badge near the top of the README for improved publication and citation visibility.

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c19050df-7ae1-46dd-a56c-04d596a927a1

📥 Commits

Reviewing files that changed from the base of the PR and between 04632a3 and ff2c541.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

A Zenodo DOI badge link was added to the README’s badge list near the top of the document.

Changes

README badge update

Layer / File(s)	Summary
Add Zenodo DOI badge README.md	Adds a Zenodo DOI badge link to the README badge list.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• fg-labs/holodeck#1: Updates the README badges area with CI, license, and branding assets.

Suggested reviewers: tfenne

Poem

A rabbit spots a DOI shine,
Beneath the badges in a line.
Zenodo hops into the view,
With links all crisp and shiny-new.
“One tiny change!” the bunny sings,
“A badge can give documentation wings.”

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding a Zenodo DOI badge to the documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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